Boring and reaming tool.



A, 0 9 1 6a 2 Y L U .J D E mi N E T A P B. BROWNSTBIN. BORING ANDREAMING TOOL.

APPLICATION FILED MAE. 1, 1904.

N0 MODEL.

In venior.

,Beiy amin Bronnsfein g 7 meg.

UNITED STATEs Patented July 26, 1904:.

PATENT ()EETQE.

BENJAMIN BROWNSTEIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALFTO HARRY L. ZOOKOVITZ, OF TRENTON, NEW JERSEY.

BORING AND REAMING TOOL- SPECIFICATION forming part of Letters PatentNo. 765,877, dated July 26, 1904.

Application filed March 1, 1904.

To a whom, it may concern.-

Be it known that I, BENJAMIN BROWNSTEIN, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inBoring and Beaming, Tools, of which the following is a specification.

This invention relates to boring-tools of annular construction adaptedto out only the exterior of the portion to be removed and at the same toalso ream the hole smooth and true. The tools are formed with a hollowshell having an annular cutting edge which cuts away only an outerconcentric ring portion of the material, the central or intermediateportion being thus removed without the expenditure of any power for itscutting away or the wearing away of the tools, resulting in a greatsaving of power, time, lubricating material, and prolonged life of thetools. The tools are especially adapted, for forming large openingswhere heretofore boring-bars were necessary and can be used in manyplaces where a boring-bar cannot be used, and means are provided toinsure a constant flow of lubricant to the cutting edges and to insureaccuracy in starting the tool by a specially-arranged center.

The invention is illustrated in the accompanying drawings, whereinsimilar reference characters indicate similar parts, in which Figure 1is an elevation view of a large size drill and reamer, partly insection. Fig. 2 is an end view of Fig. 1. Fig. 3 is an elevation of asmall drill and reamer. Fig. 4 is an end view of Fig. 3.

The larger tool, Figs. 1, 2, has a shank 1, preferably of standardtaper, so it can be employed in the same machines as the tool now inuse, and at the base of the shank the tool is enlarged in diameter andcomprises an annular shell 2 with a series'of cutting edges 3 at itslower end and therefrom grooves 4 upwardly tending. Within the shell 2is a center 5, having its upper end guided in a receptacle 6 withinshank 1 and secured to and bearing against a spiral spring 7, placed inhole 6, the upper end coil of the spring being Serial No. 196,026. (Nomodel.)

enlarged to enter a chambered recess 8, by which means the center andspring are retainedin place, but can readily be removed by pulling downon the spring and center. The spring keeps center 5 below the cuttingedges 3 when the work is commenced and allows it to recede as the workprogresses. The center 5 has also for its support from side movement aguide-plate 9 near its outer end, which fits snugly but freely withinthe annular shell 2 and recedes with the center. The

guideplate 9, shell 2, with its top 10, forms an oil-reservoir 11,filled through opening 12 by removing plug 13. Oil-hole 14 in the shankand 15 in the center, with branch openings 16, lubricate the center, andgrooves 17 within shell 2 feed the oil to cutting edges 3. As cutters 3progress the uncut center of the object being worked upon enters shell2, pushing up center 5, spring 7, and plate 9, which not only forces oilthrough grooves 17, but forms a pressure in connection with spring 7 toremove the uncut center of material from the shell when the hole iscompleted by cutting away the ring of metal. The depth of shell 2 willbe adapted to the thickness of the material operated upon.

In Figs. 3, 4 the smaller sizes of tools are illustrated. Thesehaveashank 18, preferably of standard taper, with an annular shell 19below, with cutting edges 20 and reamerfiutes 21. Within shell 19 isacenter 22, having an enlarged head 23, guided within a chamber 24 inshank 18 and connected to a spring 25, which is enlarged at its upperend to enter a chambered recess 26 for the purpose heretofore described.Center 22 has a guide-plate 27 near its lower end, which fits snugly andfreely within shell 19 and together with the shell sides and its topwall 28 forms an oil-chamber 29, having oil-grooves 30 to feed oil tothe cutters 20. Shank 18 has an oil-hole 31 entering chamber 24,surrounding spring 25, by which oil enters the chamber. Center 22 has anoil-hole 32 communicating with chamber 24 and cross-openings 33, whichpermit oil to flow to the centers point 35, and

for the same purpose as already described for the larger tool.

I claim 1. In a boring-tool, a shank, an annular cutting-shellprojecting from the shank, a center having its inner end inserted in theshank its outer end projecting from the shell and adapted to recede intothe shellas the cutting advances, resilient support for the shank, and aguide-plate at the outer end of the center and guided within the shell.

2. In aboring-tool, a shank and an annular cutting-shell, a center toguide the shell, a guide-plate at the lower end of the center, grooveson the shell, oil-grooves within the shell and adjacent the flutes, andmeans to introduce lubricating material within the shell at its top andto the center through the shank.

BENJAMIN BROXVNSTEIN.

W itnesses:

R. U. l/VRIGHT, LEWIS H. EIJDNER.

